UNIX tar (FreeBSD)

-bash$ tar --help
GNU `tar' saves many files together into a single tape or disk archive, and
can restore individual files from the archive.
Usage: tar [OPTION]... [FILE]...
Examples:
tar -cf archive.tar foo bar # Create archive.tar from files foo and bar.
tar -tvf archive.tar # List all files in archive.tar verbosely.
tar -xf archive.tar # Extract all files from archive.tar.
If a long option shows an argument as mandatory, then it is mandatory
for the equivalent short option also. Similarly for optional arguments.
Main operation mode:
-t, --list list the contents of an archive
-x, --extract, --get extract files from an archive
-c, --create create a new archive
-d, --diff, --compare find differences between archive and file system
-r, --append append files to the end of an archive
-u, --update only append files newer than copy in archive
-A, --catenate append tar files to an archive
--concatenate same as -A
--delete delete from the archive (not on mag tapes!)
Operation modifiers:
-W, --verify attempt to verify the archive after writing it
--remove-files remove files after adding them to the archive
-k, --keep-old-files don't replace existing files when extracting
--overwrite overwrite existing files when extracting
--overwrite-dir overwrite directory metadata when extracting
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